Studying the accretion geometry of EXO 2030+375 at luminosities close to the propeller regime

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Table 1

Best-fit model parameters for the phase-averaged fits.

Parameter	HighE (no PC)	HighE (with PC)	HighE+bbody	NPEX	FDcut	CPL

N_H,1 (10²² cm^-2)	6.1 ± 0.7		4.0 ± 0.7			3.9 ± 1.0
N_H,2 (10²² cm^-2)	–		–			19 ± 8
CF	–		–
ℱ (10^-11 erg cm^-2 s^-1) ^a	8.99 ± 0.18	9.9 ± 0.6	7.7 ± 0.5
A ₂	–	–	–		–	–
Γ		1.78 ± 0.09		1.11 ± 0.06	1.82 ± 0.06
E_cut (keV)		7.6 ± 0.7		–	<3.9	–
E_fold (keV)
R_bbody (km)	–	–		–	–	–
kT (keV)	–	–		–	–	–
Eqw FeKα (eV)	18 ± 12
C C _B	1.003 ± 0.008	1.003 ± 0.008	1.003 ± 0.008	1.003 ± 0.008	1.003 ± 0.008	1.003 ± 0.008
C C _XRT	0.62 ± 0.06	0.59 ± 0.06	0.59 ± 0.06	0.59 ± 0.06	0.58 ± 0.06	0.59 ± 0.06
ℒ (10³⁵ erg s^-1)^b	5.43 ± 0.11	6.0 ± 0.4	4.64 ± 0.27

χ²/ d.o.f.	717.03/660	699.44/658	694.78/658	699.45/658	763.48/658	743.66/659
	1.086	1.063	1.056	1.063	1.160	1.128

Notes. PC denotes models with partial covering, while CC_B and CC_XRT are the cross-calibration constants for NuSTAR/FPMB and Swift/XRT, respectively, with respect to NuSTAR/FPMA.

^(a)

Unabsorbed powerlaw flux between 3–10 keV;

^(b)

luminosity between 3–10 keV for a distance of 7.1 kpc.

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